Most engineers were ______ about the effectiveness of the new model of word-processors.

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问题 Most engineers were ______ about the effectiveness of the new model of word-processors.

选项 A、pessimistic
B、doubtful
C、worry
D、ignorant

答案B

解析 pessimistic悲观的：doubtful怀疑的：worry担忧；ignorant无知的。根据句意，B项是正确答案。该句中word-processors意为“文字处理器”。

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